/**
    * This file Copyright (c) 2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.ui.vaadin.gwt.client.ckeditor;
  
  
  import static info.magnolia.ui.vaadin.gwt.client.ckeditor.VMagnoliaCKEditorTextEvents.*;
  
  import java.util.Arrays;
  import java.util.List;
  
  import org.vaadin.alump.ckeditor.client.CKEditor;
  import org.vaadin.alump.ckeditor.client.VCKEditorTextField;
  
  import com.google.gwt.user.client.Timer;
  import com.vaadin.client.ApplicationConnection;
  import com.vaadin.client.UIDL;
  import com.vaadin.client.ValueMap;
  import com.vaadin.client.communication.ServerRpcQueue;
  
  /**
   * Magnolia rich text field adds an ability to custom plugins to communicate
   * with the server. This was not possible with the add-on out of the box.
   */
  public class VMagnoliaCKEditorTextField extends VCKEditorTextField implements VMagnoliaCKEditorTextEvents.Listener {
  
      private VMagnoliaCKEditor editor;
      private List<String> pluginEvents;
      private ValueMap customPlugins;
      private boolean immediate;
  
      @Override
      public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
  
          // Make sure external plugins are assigned before the loading command.
          if (uidl.hasAttribute(VAR_SERVERPLUGINS)) {
              customPlugins = uidl.getMapAttribute(VAR_SERVERPLUGINS);
          }
  
          // list of plugin events that server is interested of handling.
          if (uidl.hasAttribute(VAR_EVENTNAMES)) {
              pluginEvents = Arrays.asList(uidl.getStringArrayAttribute(VAR_EVENTNAMES));
          }
  
          if (uidl.hasAttribute(ATTR_IMMEDIATE)) {
              immediate = uidl.getBooleanAttribute(ATTR_IMMEDIATE);
          }
  
          super.updateFromUIDL(uidl, client);
  
          // Server wants to send an event to a plugin, we must do this after super value update.
          if (uidl.hasAttribute(VAR_FIRE_PLUGIN_EVENT) && this.editor != null) {
              this.editor.fire(
                      uidl.getStringAttribute(VAR_FIRE_PLUGIN_EVENT),
                      uidl.getStringAttribute(VAR_FIRE_PLUGIN_EVENT_VALUE)
              );
          }
      }
  
      @Override
      protected CKEditor loadEditor(String inPageConfig) {
          // Register external plugins
          if (customPlugins != null && customPlugins.getKeySet() != null && !customPlugins.getKeySet().isEmpty()) {
              for (String plugin : customPlugins.getKeySet()) {
                  addExternalPlugin(plugin, customPlugins.getString(plugin));
              }
          }
  
          // Set convenience base path for registering external plugins in custom config.js
         setVaadinDirUrl(clientToServer.getConfiguration().getVaadinDirUrl());
 
         // Load editor
         editor = (VMagnoliaCKEditor) super.loadEditor(inPageConfig);
         return editor;
     }
 
     private native void setVaadinDirUrl(String vaadinDirUrl) /*-{
         $wnd.CKEDITOR.vaadinDirUrl = vaadinDirUrl;
     }-*/;
 
     private native void addExternalPlugin(String pluginName, String path) /*-{
         $wnd.CKEDITOR.plugins.addExternal(pluginName, path, 'plugin.js');
     }-*/;
 
     /**
      * Add plugin listeners when instance is ready.
      */
     @Override
     public void onInstanceReady() {
         super.onInstanceReady();
 
         // Add plugin listeners
         if (pluginEvents != null && !pluginEvents.isEmpty()) {
             for (String eventName : pluginEvents) {
                 editor.addPluginListener(eventName, this);
             }
         }
     }
 
     @Override
     public void onPluginEvent(String eventName, String data) {
         if (pluginEvents.contains(eventName)) {
             clientToServer.updateVariable(paintableId, VAR_EVENT_PREFIX + eventName, data == null ? "" : data, true);
         }
     }
 
     /**
      * Override VCKEditorTextField's default behavior, defer update in case field is immediate.
      */
     @Override
     public void onChange() {
         if (editor != null && !editor.isReadOnly()) {
             clientToServer.updateVariable(paintableId, VAR_TEXT, editor.getData(), false);
             if (immediate) {
                 valueUpdateTimer.schedule(200);
             }
         }
     }
 
     private Timer valueUpdateTimer = new Timer() {
         @Override
         public void run() {
             ServerRpcQueue.get(clientToServer).flush();
         }
     };
 
     @Override
     public void doResize() {
         super.doResize();
     }
 }